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材料导报  2020, Vol. 34 Issue (6): 6010-6014    https://doi.org/10.11896/cldb.19010221
  无机非金属及其复合材料 |
外延掺锰铁酸铋薄膜电容器的光电导和光伏效应
彭增伟1, 刘保亭2
1 华北电力大学科技学院,保定 071051;
2 河北大学物理科学与技术学院,保定 071002
Photoconductivity and Photovoltaic Effect of Epitaxial Mn-doped BiFeO3 Thin Film Capacitor
PENG Zengwei1, LIU Baoting2
1 College of Science and Technology, North China Electric Power University, Baoding 071051, China;
2 College of Physics Science and Technology, Hebei University, Baoding 071002, China
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摘要 采用射频磁控溅射的方法在SrRuO3/SrTiO3(SRO/STO)衬底上制备了外延Mn掺杂的BiFeO3(BFMO)薄膜,并以Pt/SRO为复合上电极构建了对称的SRO/BFMO/SRO薄膜电容器。X射线衍射揭示了BFMO薄膜具有良好的外延结构。极化-电场滞后回线、净极化强度的测试结果说明外延SRO/BFMO/SRO电容器具有较大的剩余极化强度。波长为404nm、强度为5mW/cm2的紫光入射到SRO/BFMO/SRO电容器表面,电流密度相应增长。当测试电压为+8V,无光和光照时的电流密度分别为0.14A/cm2和0.34A/cm2;当测试电压为-8V,无光和光照时的电流密度分别为0.13A/cm2和0.33A/cm2。通过对电流密度的拟合发现:无光和光照时均为欧姆传导机制,光照并没有改变SRO/BFMO/SRO电容器的传导机制。SRO/BFMO/SRO电容器的光伏效应主要由薄膜内部极化决定。与纯BFO薄膜电容器相比,Mn掺杂增大了光伏输出的短路电流密度。
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彭增伟
刘保亭
关键词:  掺杂  锰  铁酸铋薄膜  光电导  光伏效应    
Abstract: Epitaxial Mn-doped BiFeO3 (BFMO) thin film was directly deposited on SrRuO3 (SRO) buffered (001)-orientation SrTiO3 (STO) substrate by radio frequency magnetron sputtering. Using integrated Pt/SRO to be top electrode to form the symmetric SRO/BFMO/SRO capacitor. X-ray diffraction discovers that BFMO film is of good epitaxial structure. Polarization-electric field hysteresis loops and pulsed polarization show that epitaxial SRO/BFMO/SRO capacitor possesses excellently ferroelectric polarization. The increased leakage current density is acquired when the SRO/BFMO/SRO capacitor is illuminated by the purple light of 5 mW/cm2 with a wavelength of 404 nm. The leakage current density is 0.14 A/cm2 and 0.34 A/cm2 at 8 V without and with illumination, and 0.13 A/cm2 and 0.33 A/cm2 at -8 V without and with illumination, respectively. The ohmic conduction is the dominated leakage mechanism which is not changed by illumination. Photovoltaic effect of the SRO/BFMO/SRO capacitor is mainly controlled by the ferroelectric polarization. Mn doping increases the short circuit current density in photovoltaic effect of the SRO/BFMO/SRO capacitor, compared with that of pure BiFeO3 film capacitor.
Key words:  doping    Mn    BiFeO3 thin film    photoconductivity    photovoltaic effect
                    发布日期:  2020-03-12
ZTFLH:  O484.1  
  O482.7  
基金资助: 中央高校基本科研业务费专项资金(2016MS157);国家自然科学基金(11374086);河北省自然科学基金(A2018201168)
作者简介:  彭增伟,华北电力大学科技学院讲师。2005年河北大学物理学硕士研究生毕业进入华北电力大学科技学院任教,于2009年9月—2013年6月期间在河北大学攻读光学工程专业并获得博士学位。研究方向主要为铁电材料的光电导和光伏特性。作为第一作者在国内外学术期刊上发表论文10余篇,其中SCI收录7篇,EI收录4篇。主持两项中央高校基本科研业务费项目,同时担任Applied Physics Letters, Journal of Applied Physics, Journal of Physics D: Applied Physics, Materials Science in Semiconductor Processing等学术期刊的审稿人。
引用本文:    
彭增伟, 刘保亭. 外延掺锰铁酸铋薄膜电容器的光电导和光伏效应[J]. 材料导报, 2020, 34(6): 6010-6014.
PENG Zengwei, LIU Baoting. Photoconductivity and Photovoltaic Effect of Epitaxial Mn-doped BiFeO3 Thin Film Capacitor. Materials Reports, 2020, 34(6): 6010-6014.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19010221  或          http://www.mater-rep.com/CN/Y2020/V34/I6/6010
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